Also in this week's column:
Does urinating after sex prevent catching HIV or other infections?
How much damage does a tapeworm do to the human body?
Is it dangerous to wake a sleepwalker?
Great moments in human research 1: "Concluding, among other things..."
The Ig Nobel Prizes are awarded to research that is not exactly …

Porcelain

Porcelain toilet accidents are occasionally the result of people who are accustomed to squatting attempting to use one. Finding it impossible to defacate in the sitting postion, they climb and put their feet on the rim (sorry) of the pedestal.

This places tensile stress on the porcelain, which shatters it. The injuries, as you can imagine, are horiffic.